Utility lighter

ABSTRACT

A utility lighter includes a locking stopper fitted in a locker groove of a button body of an ignition button in an inwardly movable manner and a resilient element mounted between the locking stopper and the ignition button to normally urge and retain the locking stopper positioning between a pusher head of the ignition button and a locking flange of a piezoelectric unit housing of the utility lighter, so as to block an downwardly movement of the ignition button and prevent the ignition operation of the piezoelectric unit. In order to ignite the utility lighter, an adult user&#39;s thumb must intentionally push the locking stopper inwardly until the locking stopper is unblocked by the locking flange and then push down the ignition button at the same time.

BACKGROUND OF THE PRESENT INVENTION

[0001] 1. Field of Invention

[0002] The present invention relates to lighters, and more particularly to a utility lighter which is advantageous in practical use, wherein the utility lighter comprises a safety device for normally locking an ignition button of the utility lighter to prevent the utility lighter from being ignited accidentally or by children.

[0003] 2. Description of Related Arts

[0004] Utility lighters, such as barbecue lighters or candle lighters, have been known and sold throughout the world. The advantageous of such utility lighters is that each lighter comprises an elongated nozzle tube to ignite candles or a stove while a user stays away therefrom.

[0005] The conventional utility lighter A, as shown in FIG. 8A, comprises a trigger A1, which is positioned below a handle A2 thereof and operatively arranged to be depressed for igniting the lighter A, and a finger guide A3 encircling a finger cavity for fitting a user's index finger to engage therethrough to press a trigger A1. In order to ignite the utility lighter A, the user's index finger must engage through the finger guide A3 to press on the trigger A1. Since the index finger is weaker than the thumb that the female or senior users may find difficulty to operate the utility lighter A.

[0006] Most accidental fire cases were started by the ignorant usage of the lighter, especially a barbecue lighter used at home such as pilot light for stoves or outdoor activities such as fireplaces or camping. Those accidental fires are causes by ignorance of human mistakes, especially among young children.

[0007] For safety reasons, the conventional utility lighter A generally employs a lock switch A4 that requires the user to push and switch it to an unlocked position for ignition, or otherwise the trigger will be locked up while the lock switch A4 is positioned at a locked position. In fact, such lock switch A4 can only prevent accidental ignition but cannot stop children from igniting it. Usually, the lock switch A4 is simply placed at one side of the utility lighter A. In most cases, children can easily figure out how to ignite these utility lighter A by switching the lock switch A4 to its unlocked position. Thus, the utility lighter A requires a double-action operation by the user's thumb and index finger operating the lock switch A4 and the trigger A1 respectively.

[0008] Moreover, the user, after each ignition, must switch back the lock switch A4 back to its locked position in order to lock up the trigger A1, so that if the user forgets to switch the lock switch A4 back to its locked position, the utility lighter A has no safety at all. In most cases, children can easily figure out how to ignite these utility lighters A by switching the lock switch A4 to its unlocked position.

[0009] Thus, the utility lighter requires a double-action operation by the user's thumb and index finger respectively operating the lock switch and the trigger button at the same time. Another type of conventional utility lighter B, as shown in FIG. 8B, resolves the above problem by employing a safety switch B4 for locking up the ignition trigger B1 so as to prevent the ignition trigger B1 of the lighter B from accidentally being depressed thereby causing an unintended ejection. The safety switch B4 is perpendicularly mounted on the casing of the utility lighter B with respect to the trigger B1, wherein a resilient element is mounted under the safety switch B4 for rebounding the safety switch B4 to its original position, so as to re-lock the utility lighter B after every ignition. Therefore, in order to ignite the barbecue lighter B, a user's thumb must press the safety switch B4 downward while the user's finger must depress the trigger B1.

[0010] However, such utility lighter B does not work for the smart children today. Stronger child can use one hand to press down the safety switch B4 and the other hand to depress the trigger B1. It is reported that some children even press the safety switch B4 against a rigid hard surface with their bodies so that they have both hands to depress the trigger B1. In other words, the improved conventional utility lighter B is still not safe enough to prevent under age children from using the utility lighter.

[0011] As shown in FIGS. 8A and 8B, the ignition triggers A1, B1 of the conventional utility lighters A and B are respectively provided at the bottom side of the handles A2, B2. In order to operate the conventional utility lighter, the user generally requires to hold the handle A2, B2 with his or her hand and uses his or her index finger to depress the trigger A1, B1 like operating a pistol. In fact, most children like to play with the utility lighter because it likes to operate a pistol. To the kids, the utility lighter is an exciting fire gun that attracts the children to play.

SUMMARY OF THE PRESENT INVENTION

[0012] A main object of the present invention is to provide a utility lighter that the user can only use one thumb to operate both the safety lock and the trigger so as to provide secure safety that prevents the utility lighter from being ignited accidentally and the under age children from using the utility lighter.

[0013] Another object of the present invention is to provide a utility lighter wherein the ignition of the utility lighter of the present invention requires a simple single-action operation by an adult's thumb instead of the conventional double-action operation.

[0014] Another object of the present invention is to provide a utility lighter wherein the a piezoelectric unit of the utility lighter is normally maintain in a locking position, so as to prevent any unwanted ignition of the lighter.

[0015] Another object of the present invention is to provide a utility lighter wherein a safety device of the utility lighter can automatically return to a locking condition after each ignition operation, so as to prevent any lighting operation of the piezoelectric unit by locking up the downward movement of the thumb button.

[0016] Another object of the present invention is to provide a utility lighter wherein the safety device of the present invention is employed with the ignition button which eliminates the need of constructing any conventional switch button or locking button additionally that may unreasonable increase the manufacturing cost.

[0017] Another object of the present invention is to provide a utility lighter wherein the ignition button which is provided at a top side of the casing is used to substitute the trigger of the conventional utility lighter that eliminates the similarity of operating a pistol so as to prevent attracting children to play with. Moreover, the thumb-operated type ignition button of the present invention is easier to operate by the powerful thumb of an adult than the index finger operated type trigger of the conventional utility lighter. A child may use more than one fingers to depress a trigger to increase the applying force while his or her single small thumb is not strong enough to operate the ignition button of the present invention.

[0018] Accordingly, in order to accomplish the above objects, the present invention provides a utility lighter, comprising:

[0019] a casing having a liquefied gas storage, a piezoelectric unit housing and a pusher cavity defined therein;

[0020] a gas emitting unit extended from and communicated with said liquefied gas storage in the casing;

[0021] an elongated nozzle tube extended from the casing for encircling the gas emitting unit;

[0022] a piezoelectric unit fitted in the piezoelectric unit housing for generating piezoelectricity, wherein the piezoelectric unit comprises a movable operating part upwardly extended from the pusher cavity and an ignition tip extended adjacent to the gas emitting tip;

[0023] an ignition button which is slidably fitted in the pusher cavity of the casing and coupled with a top end of the piezoelectric unit, wherein the ignition button comprises a button body and a pusher head provided on top of the button body and exposing above the piezoelectric unit housing; and

[0024] a safety device comprising a locking flange provided at an edge portion of an outer wall of the piezoelectric unit housing, a locking stopper disposed between the button body and the locking flange in an inwardly movable manner, and a resilient means mounted between the locking stopper and the ignition button for normally urging and retaining the locking stopper positioning between the pusher head and the locking flange of the piezoelectric unit housing so as to block a downward movement of the ignition button and prevent an ignition operation of the piezoelectric unit.

[0025] In order to ignite the utility lighter of the present invention, an adult user's thumb must intentionally push in the locking stopper until the locking stopper is pressed to move inwardly away from the locking flange and push down the ignition button at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026]FIG. 1 is a perspective view of a utility lighter according to a preferred embodiment of the present invention.

[0027]FIG. 2 is a partially exploded perspective view of the utility lighter according to the preferred embodiment of the present invention.

[0028]FIG. 3 is sectional view of the utility lighter according to the preferred embodiment of the present invention.

[0029]FIG. 4 is a partially exploded perspective view of a utility lighter according to an alternative mode of the above preferred embodiment of the present invention.

[0030]FIG. 5 is a schematic side view of the utility lighter in a locked condition according to the alternative mode of the above preferred embodiment of the present invention.

[0031]FIG. 6 is a schematic side view of the utility lighter in an unlocked condition according to the alternative mode of the above preferred embodiment of the present invention.

[0032]FIG. 7 is a top view illustrating a safety device having an alternative resilient unit for the present invention.

[0033]FIGS. 8A and 8B are perspective views of two conventional utility lighters.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0034] Referring to FIGS. 1 and 3 of the drawings, a utility lighter according to a preferred embodiment of the present invention is illustrated. The utility lighter comprises a casing 10 comprising a rear handle portion 101 and a front extension potion 102. The casing 10 further has a liquefied gas storage 11, a piezoelectric unit housing 12 and a pusher cavity 13 defined therein, wherein the piezoelectric unit housing 12 is provided adjacent to the liquefied gas storage 11 and a pusher cavity 13 is located right above the piezoelectric unit housing 12.

[0035] The liquefied gas storage 11 comprises a liquefied gas container 14 received therein. The utility lighter further comprises a gas emitting unit 21 extended from and communicated with the liquefied gas storage 11 in the casing 10 and an elongated nozzle tube 20 extended from the casing 10 for encircling the gas emitting unit 21.

[0036] The gas emitting unit 21, as shown in FIG. 3, comprises a gas emitting nozzle 141 mounted on top of the liquefied gas container 14 to provide liquefied gas through the gas emitting nozzle 141, a gas emitting tip 22 positioned inside a distil end of the elongated nozzle tube 20, and a gas tube extended between the gas emitting nozzle 141 to the gas emitting tip 22 inside the elongated nozzle tube 20 to deliver liquefied gas from the gas emitting nozzle 141 to the gas emitting tip 22.

[0037] As shown in FIGS. 2 and 3, the utility lighter comprises a piezoelectric unit 30 which is fitted in the piezoelectric unit housing 12 for generating piezoelectricity, wherein the piezoelectric unit 30 comprises a movable operating part 31 upwardly extended from the pusher cavity 13 and an ignition tip 32 which is extended to the distil end of the elongated nozzle tube 20 to produce sparks towards the gas emitting tip 22 to ignite the gas emitted from the gas emitting tip 22.

[0038] As shown in FIGS. 2 and 3, the utility lighter also comprises an ignition button 40 which is slidably disposed in the pusher cavity 13 of the casing 10 in a vertically movable manner. The ignition button 40, which is attached to a top end of the piezoelectric unit 30, comprises a button body 41 and a pusher head 42 provided on top of the button body 41 and exposing above the piezoelectric unit housing 12, wherein a locker groove 43 is provided on of the button body 41. Also, a flame regulator 15 is coupled with the gas emitting nozzle 141 to control the flow of gas through the gas emitting nozzle 141, as shown in FIG. 3.

[0039] As shown in FIG. 2, the locker grooves 43, which is formed on an outer side of the button body 41, has a wider upper portion 431 and a narrower lower portion 432. The button body 41 further has two side button walls 411, 412 parallelly and downwardly extended from the pusher head 42. The movable operating part 31 of the piezoelectric unit 30 is extended to fit inside button body 41. On an upper portion of an outer surface of each side button wall 411, 412, at least a spring hole 413, 414 is provided thereon.

[0040] As shown in FIGS. 1, 2 and 3, the utility lighter of the present invention further comprises a safety device 50 which comprises a locking flange 123 provided at an edge portion of an outer wall 122 of the piezoelectric unit housing 12, a locking stopper 51 disposed between the button body 41 and the locking flange 123 in an inwardly movable manner, and a resilient means 52 mounted between the locking stopper 51 and the ignition button 41 for normally urging and retaining the locking stopper 51 positioning between the pusher head 42 and the locking flange 123 of the piezoelectric unit housing 10 so as to block a downwardly movement of the ignition button 40 and prevent the ignition operation of the piezoelectric unit 30.

[0041] According to the preferred embodiment of the present invention, a top edge, having a predetermined thickness, of an outer wall 122 of the piezoelectric unit housing 12 is embodied and functioned as the locking flange 123.

[0042] According to the preferred embodiment, the locking stopper 51 comprises a pushing button 511 having a shape and size adapted for fitting in the upper portion 431 of the locker groove 43 and a blocking tongue 512 downwardly extended from the pushing button 511. The blocking tongue 512 has a width narrower than a width of the pushing button 511 for fitting in the lower portion 432 of the locker groove 43. Normally, when the locking stopper 51 fits in the locker groove 43, the locking stopper 51 is positioned in a locking condition, that is blocked between the pusher head 42 and the locking flange 123.

[0043] The locking stopper 51 further comprises two guiding arms 513, 514 transversally extended from two inner sides of the pushing button 511 thereof respectively, wherein the guiding arms 513, 514 are slidably received in two slider tracks 415, 416 respectively indented on two outer sidewalls of the button body 41 transversally so as to ensure the inward movement of the locking stopper 51 with respect to the ignition button 40.

[0044] As shown in FIG. 2, the resilient means 52 comprises two compression springs 521, 522 each having one end inserted into the respective spring hole 413, 414 and another end urging against an inner surface of the pushing button 511. By means of the two compression springs 521, 522 of the resilient means 52, the locking stopper 51 is normally urged and retained in the locking condition, i.e. positioning between the pusher head 42 and the locking flange 123 of the piezoelectric unit housing 12. Therefore, the ignition button 40 is normally locked up by blocking its downwardly movement with the locking stopper 51. Even an adult is unable to press down the blocked ignition button 40 as usual with his or thumb to ignite the piezoelectric lighter of the present invention.

[0045] In order to ignite the utility lighter of the present invention, as shown in FIG. 3, an adult user's thumb must intentionally push in the locking stopper 51 until it is unblocked with respect to the locking flange 123 and then press down the ignition button 40 at the same time.

[0046] In other words, according to the present invention as shown in FIG. 3, in order to ignite the utility lighter, a sideward force F1 and a downward force F2 must be applied to the pushing button 511 and the pusher head 42 simultaneously and no switch is need to operate. When the sideward force F1 inwardly presses the pushing button 511, the blocking tongue 512 is disaligned with the locking flange 123, such that the downward force F2 can push down the ignition button 40 simultaneously to depress the movable operating part 31 of the piezoelectric unit 30 to ignite the utility lighter.

[0047] Once the downward force F2 applied on the ignition button 40 is released, the compressed piezoelectric unit 30 will rebound to its original condition which pushes the ignition button 40 back to its original position. Then, the two compression springs 521, 522 of the resilient means 52 will automatically push out the locking stopper 51 to return to its original position, i.e. positioning between the pusher head 42 and the locking flange 123 of the piezoelectric unit housing 12.

[0048] Referring to FIG. 4, an alternative mode of the above preferred embodiment is illustrated. Basically, the utility lighter of the alternative mode comprises identical components and structure as recited in the above preferred embodiment, except that, as shown in FIG. 4, the locking stopper 51′ comprises two guiding arms 513′, 514′ transversally and elastically extended from two inner sides of the pushing button 511′ thereof respectively, wherein a free end of each of the guiding arms 513′, 514′ forms a triangular engagement latch 515′, 516′ adapted for receiving in an engagement socket 121′, 122′ formed at an inner end of the respective slider track.

[0049] As shown in FIGS. 5 and 6, the two guiding arms 513′, 514′ are slidably extended underneath the two bottom sides of the pusher head 42′ along the slider tracks 415′, 416′ respectively to enable the two engagement latches 515′, 516′ being reachable with respect to the two engagement sockets 121′, 122′ respectively.

[0050] Normally, as shown in FIG. 5, the two compression springs 521′, 522′ bias against the inner surface of the pushing button 511′, i.e. positioning between the pusher head 42 and the locking flange 123 of the piezoelectric unit housing 12′. During the locking position, the two engagement latches 515′, 516′ rest below the two bottom sides of the pusher head 42′ without engaging with the two engagement sockets 121′, 122′. Therefore, the ignition button 40′ is normally locked up by blocking its downwardly movement with the locking stopper 51. Even an adult is unable to press down the blocked ignition button 40′ as usual with his or her thumb to ignite the utility lighter of the present invention.

[0051] To ignite the utility lighter of the present invention, as shown in FIG. 6, a sideward force F1 can first apply to the pushing button 511′ inwardly so as to push the locking stopper 51 inwardly until the two engagement latches 515′, 516′ of the two guiding arms 513′, 514′ thereof are engaged with the two engagement sockets 121′, 122′ respectively. During such unlocking condition, the pushing button 511′ and the blocking tongue 512′ are both retained in an inner position where the blocking tongue 512′ is disaligned with the locking flange 123′, so that the user may simple apply a downward force F2 to push down the ignition button 40′ to depress the movable operating part 31′ of the piezoelectric unit 30′ to ignite the utility lighter.

[0052] Furthermore, when the downward force F2 is applied on the ignition button 40′, the downward force F2 will also release the engagement of the two engagement latches 515′, 516′ with the two engagement sockets 121′, 122′. So, while releasing the downward force F2 on the ignition button 40′, the two compression springs 521′, 522′ of the resilient means 52′ will automatically push out the locking stopper 51′ to return to its original locking position as recited above.

[0053] It is worth to especially mention that, as shown in FIG. 1, the ignition button 40 is provided at a top side of the casing 10, positioning between the handle portion 101 and the extension portion 102. Unlike the conventional utility lighters A and B. as mentioned in the background and shown in FIGS. 8A and 8B, the ignition triggers A1, B1 are respectively provided at the bottom side of the handles A2, B2. In order to operate the conventional utility lighter, the user generally requires to hold the handle A2, B2 with his or her hand and uses his or her index finger to depress the trigger A1, B1 like operating a pistol. In fact, most children like to play with the utility lighter because it likes to operate a pistol. To the kids, the utility lighter is an exciting fire gun that attracts the children to play.

[0054] However, according to the utility lighter of the present invention, the ignition button 40 which is provided at a top side of the casing 10 substitutes the ignition trigger A1, B1 of the conventional utility lighter A, B that eliminates the similarity of operating a pistol so as to prevent attracting children to play with. To operate the utility lighter, a shown in FIG. 1, the user must use his or her four fingers grip around an arc-shaped finger rest portion 103 provided at a bottom side of the handle 102 while his or her thumb rests on the top side of the handle 102 and is free to operate the ignition button 40 as shown in FIG. 3. Since the thumb is more powerful and active than the index finger, the thumb-operated type ignition button 40 of the present invention is easier to operate by the powerful thumb of an adult than the index finger operated type ignition trigger A1, B1 of the conventional utility lighter A. B. A child may use more than one fingers to depress an ignition trigger A1, B1 to increase the applying force while his or her single small thumb is not strong enough to push in the locking stopper 51 and depress the ignition button 40 of the present invention simultaneously.

[0055] In view of above, the ignition operation of the utility lighter requires a simple single-action operation by an adult's thumb which has more power and bigger size than the index finger and thus can actuate the flame regulator 15 by the user's index finger at the same time. So, the utility lighter is advantageous in practical use. Thus, the size of a child's thumb is impossible to apply the sideward force F1 and the downward force F2 on the pushing button 511 and the pusher head 42 simultaneously, so as to guarantee the safety of children. Moreover, it can automatically reset the locking stopper 51 to the locking position after each ignition of the utility lighter by means of the resilient means 52. In other words, the utility lighter of the present invention is normally locked. Even after an ignition, no additional action has to take to re-lock the utility lighter.

[0056]FIG. 7 illustrates an alternative mode of the resilient means 52, wherein a curved spring strip 520 is capable of substituting the two compression springs 521, 522, as shown in FIGS. 2 and 4, for biasing against the locking stopper 51 outwardly by pressing to ends of the spring strip 520 against the pushing button 511 while the curved middle portion urging against the pusher head 42 of the ignition button 40. 

What is claimed is:
 1. A utility lighter, comprising: a casing having a liquefied gas storage, a piezoelectric unit housing and a pusher cavity defined therein; a gas emitting unit extended from and communicated with said liquefied gas storage in said casing; an elongated nozzle tube extended from said casing for encircling said gas emitting unit; a piezoelectric unit fitted in said piezoelectric unit housing for generating piezoelectricity, wherein said piezoelectric unit comprises a movable operating part upwardly extended from said pusher cavity and an ignition tip extended adjacent to said gas emitting tip; an ignition button which is slidably fitted in said pusher cavity of said casing and coupled with a top end of said piezoelectric unit, wherein said ignition button comprises a button body and a pusher head provided on top of said button body and exposing above said piezoelectric unit housing; and a safety device comprising a locking flange provided at an edge portion of an outer wall of said piezoelectric unit housing, a locking stopper disposed between said button body, and said locking flange in an inwardly movable manner, and a resilient means mounted between said locking stopper and said ignition button for normally urging and retaining said locking stopper positioning between said pusher head and said locking flange of said piezoelectric unit housing so as to block a downward movement of said ignition button and prevent an ignition operation of said piezoelectric unit.
 2. A utility lighter, as recited in claim 1, wherein said ignition button is provided at a top side of said casing, which further comprises a handle portion, adapted for a user to hold said utility lighter with four fingers gripping around a bottom side of said handle portion of said casing and a thumb resting on said top side to operate said ignition button.
 3. A utility lighter, as recited in claim 1, wherein said locking flange is a top edge, having a predetermined thickness, of an outer wall of said piezoelectric unit housing.
 4. A utility lighter, as recited in claim 2, wherein said locking flange is a top edge, having a predetermined thickness, of an outer wall of said piezoelectric unit housing.
 5. A utility lighter, as recited in claim 1, wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.
 6. A utility lighter, as recited in claim 2, wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.
 7. A utility lighter, as recited in claim 3, wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.
 8. A utility lighter, as recited in claim 4, wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.
 9. A utility lighter, as recited in claim 5, wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.
 10. A utility lighter, as recited in claim 6, wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.
 11. A utility lighter, as recited in claim 7, wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.
 12. A utility lighter, as recited in claim 8, wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.
 13. A utility lighter, as recited in claim 5, wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.
 14. A utility lighter, as recited in claim 6, wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.
 15. A utility lighter, as recited in claim 9, wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.
 16. A utility lighter, as recited in claim 10, wherein a locker groove is provided on a front side of said button body and said locking stopper having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.
 17. A utility lighter, as recited in claim 13, wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.
 18. A utility lighter, as recited in claim 14, wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.
 19. A utility lighter, as recited in claim 15, wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.
 20. A utility lighter, as recited in claim 16, wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.
 21. A utility lighter, as recited in claim 13, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.
 22. A utility lighter, as recited in claim 14, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.
 23. A utility lighter, as recited in claim 15, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.
 24. A utility lighter, as recited in claim 16, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.
 25. A utility lighter, as recited in claim 18, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.
 26. A utility lighter, as recited in claim 20, wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove. 